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Cpython v3.15.0a8

Cpython: v3.15.0a8 Release

Release date:
April 7, 2026
Previous version:
v3.15.0a7 (released March 10, 2026)
Magnitude:
20,217 Diff Delta
Contributors:
74 total committers
Data confidence:
Commits:
258 impacting commits

261 Features Released with v3.15.0a8

gh-146151: memoryview supports 'F' and 'D' format types (complex)
#146241
gh-146080: fix a crash in SNI callbacks when the SSL object is gone
#146573
GH-146128: Remove the buggy AArch64 "33rx" relocation
#146263
gh-146197: Add Emscripten to CI
#146198
gh-146308: Fix error handling issues in _remote_debugging module
#146309
gh-146059: Cleanup pickle fast_save_enter() test
#146481
gh-146440: Add "array_hook" parameter to JSON decoders
#146441
gh-147856: Allow the 'count' argument of `bytes.replace()` to be a keyword
#147943
gh-131798: relax GUARD_CALLABLE checks for self type checks
#148069
[3.14] gh-144984: Fix crash in Expat's `ExternalEntityParserCreate` error paths (GH-144992)
#146019
gh-145410: Add _sysconfig.get_platform() function
#146145
gh-146092: Fix error handling in _BINARY_OP_ADD_UNICODE opcode
#146117
[3.13] gh-145599, CVE 2026-3644: Reject control characters in `http.cookies.Morsel.update()` (GH-145600)
#146024
gh-146587: fix type slot assignment incase of multiple slots for same name
#146593
gh-146238: support half-floats in the array module
#146242
[3.14] gh-145883: Fix two heap-buffer-overflows in `_zoneinfo` (GH-145885)
#148087
gh-147988: Initialize digits in long_alloc() in debug mode
#147989
gh-148029: Fix error message for invalid number of Base32 characters
#148030
gh-145649: Fix man page text wrapping for -X option
#145656
gh-144319: Fix huge page leak in datastack chunk allocator
#147963
gh-148110: Resolve lazy import filter names for relative imports
#148111
gh-130472: Remove readline-only hacks from PyREPL completions
#148161
gh-140049: Colorize exception notes in `traceback.py`
#140051
gh-145986: Avoid unbound C recursion in `conv_content_model` in `pyexpat.c` (CVE 2026-4224)
#145987
gh-146480: Override the exception in _PyErr_SetKeyError()
#146486
gh-145713: fix: make bytearray.resize thread-safe
#145714
gh-145177: Put node version into emscripten/config.toml as well.
#146156
gh-145000: Run `check-html-ids.py` in CI
#145632
gh-146446: Miscellaneous improvements to iOS XCframework build script
#146447
gh-144503: Pass sys.argv to forkserver as real argv elements
#148194

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Top Contributors in v3.15.0a8

serhiy-storchaka
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StanFromIreland
ivonastojanovic
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